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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c7ed1ccf2896b9354f54de1dc9dc71df5e6177293b60fea73139837bdc8c4f' 
  AND token = 'WF7dkZJNoKDFbgsIOh3ydS47yqUmNflpZavyRQ3RZdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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