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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56d7566d9572764c55195f55c37d4cd9293e5128099deb35069645513d5bb3b' 
  AND token = 'hnF9k/b5vSdhRs84f2Ha7kfcNzIPMDds7XH6B6noTyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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