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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37c982219562898463e8a2c24b7ebf5617345b4d63acbd06d024c452221f17d' 
  AND token = '3tQ1wQ3fAPIzny5GftmDOYneBbojsWxuMSVbORvuXpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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