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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd45ec91e1ad72bc879d046100aeba2beed633e8e9abab2cba2e157fdb834c4' 
  AND token = 'KqRHixmYkprpd7ZLYI2bHpsQhdRbZ/MHlqM0436aY9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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