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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8954c3e79118777ba36a8ba46f9532d04434625c843df5daaaa6bf2ebd72b8' 
  AND token = 'SlWxVvc5tVAtk5tMmOpA2PeLYAgGFiYqpmL7m3TN4F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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