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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83cc422dc37b37fddb15b169871c24fa18c7e61d18af633ae1fe654fcbfadb0' 
  AND token = 'IZEmyANRKH34nsNfI3setjVyHym4ywtjkxE9j7Kl20s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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