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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3145bc026469e2e6eb704135e68e32d436be6b0893ff46af1f68f023c26f10ba' 
  AND token = 'qNdaxGEgdEk/YNnkY9N6gBn95HPNrRo8+do7jbyRQzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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