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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad69da56e6f218a762e2c1e67992ff567383e921a8a1c9b5a058a4a48acf1c49' 
  AND token = 'xxj/ZZCMRjMDYulSZZXav2tg4AVez9DP6/s9gNc3Uug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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