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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbc486b16ec44518aa93791b240c9a17b5f7d0ed346d776972de8379eb83d6e' 
  AND token = 'Z6Zs5bGM8h1+nKdu7fjNIp6J3Sb+/9kiLHzcKQUUoM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}