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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a73710465af798477df8625f4d338abba61ca4075ff4664d7cada232c650f1e' 
  AND token = 'LQ9foIUxRQEcHjxJ1jHvRgt6gsAadeEoSG7usUO91gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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