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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2560ce54c1f20b365e1b49127c6c176636cfb62c2149b4601ec8fc821175e21a' 
  AND token = '7lIo9au34dy5f4tBQkpzDinP4IWPkQhA/KJ8rf7EB80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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