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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdeaf990efcad41ec1886ee6940f561ad55ed65bfa9764bf84f14f8e41f62fd' 
  AND token = 'zwo1ncF/UIpCjd1JnpOcArpYQ7LeQqlW2ZmUKKUsnNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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