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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7738ed091d16c73a5a099ca9113c392b275eb91ffd450104e67a2f37987b4ff' 
  AND token = 'wpcwe5xUiouDqD92DsBeTwHvF/V6258ZQdw2+bdZdPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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