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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9ed0f1116d90c34514bbbdf4a3863565ea04a8a3d920b973951c36a60d8f8e' 
  AND token = 'E/vR4Ljm0L7A373CbfKQTPbZ42Dr4vHKXMJgJ4gkags=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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