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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57af08bb406b7ccca48bb09d247b56e727cdc9d1d7e53e442d14ebab0cfff3c' 
  AND token = '1mEZ8McixbDL7EP6VnhgVQDliMWuEu++L3XDubSTYVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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