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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007ea45c8639db5c93d4ab6b1d4ae851d36edea0f7ff790bb1d03cd0991fc49d' 
  AND token = 'PJTBmw/66xGByzUfyHO8fng6vZPz/DTe6FX2OarAF+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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