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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be27ea8db5cc004b7e63392e6eb6e7d05ec3eef42e059b74cb74b716b7d67fcc' 
  AND token = 'DgUx6cdT7gpVP+hHOd6Z9z0y5AzXcCYHXqoCp+ydtuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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