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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636cb9a30b447756879ced9be5e324c434ff877b7c514d7d368d7cc23e3c9f1d' 
  AND token = 'I22CgK96d6X9xkRlFaYtmYIwb82vjaS+pHk/3Tx1tqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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