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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab79b242f479b1a81827f78ffa4e893e5e2de16b705d9d15d81e50d5a930c0c' 
  AND token = '9A/bwixFj6bCtJWnIblIEmMSOi0XVkGRi1gyCjqtbv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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