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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6f781b9127a8a6c185e653b322b2c74bb3721dbd92ae11bf2e187da0a8cc85' 
  AND token = 'm3dKCfpxFXRo+8cKRPS57dCEjaiYp48qXlYaWhr3BmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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