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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2fa43d3ba6bdad32180502eae5d614f0cefcc9b3c9b1d1e34d07d3129abfb5' 
  AND token = 'gVj1gRNknjDxECg1Jb47OogMU1v7qt2jXbqx/ecp0c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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