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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b709557c0d77d1c8db556c414133a7d940bec6fa06d4524e55dd09ec55e3e50' 
  AND token = '0oM9Ifp38rYClYgrXIcF2fwHFNZOLV/3S5100PDG0eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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