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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c271d5124ab5eb71ac8c858d474128b4d8586860602a6a230e38d530ab5ad19' 
  AND token = 'Cu+zThCjyqjiEGw6heSqaCN6NeayhveFr98PmFTeGdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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