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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f266c82026f49bb8c39898df813c10533f440f8a3686b75cacc3decfc90a7f1' 
  AND token = 'YG0JPWIa6JkPddZzJ0H7kHNvGqtwBjHvyMhPTA0fLME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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