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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a536ab830d1d01cc2d260e00340a164a740c659f25d0e40b695150d4d309641c' 
  AND token = 'o5N/eXIGSpjb9fLo5puaO0NPdl6wNrQxSshnstJoTac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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