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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f397d9cede00f206cd6c9ebd518d07ed44c24c918661fddb9a60d1b154b760e' 
  AND token = 'dyiuP20+fmvUb0HCFtAHIcbah2PjKN9Fr2/UobANPw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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