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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0226d6d43033cc197e2c24c2512ca401bb8b47a427ca3b627304fc948612327c' 
  AND token = 'DVi7aHMz0IXa4XWljouLdeE7DHEP0bEQBF6iHIU0pSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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