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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2d667e0e016840724efb9ff529a36316afcfc2222b3cdf9a7ccd1c925f0826' 
  AND token = 'EoNbP5UY/oKU3MokbTYRVzi6pMX0/seG5cHNKlGxp0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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