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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcacf5081e031b8240eb0f6dec96441527a0c988e207dc3aa623e72180d9cc1' 
  AND token = '1CDdNuz4kA3BYgXNXBmtQKTJILVHf+Z6bedcZoE0zaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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