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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac7025bd4bc2190fe8f54321dedfbbbd9c7b8c6f4b5228b143e33a747d40da8' 
  AND token = 'VhnLCFqLf6iRWp1YP2dl5Ln25cWo1g2kXhVxnn7Dxfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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