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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b09d2b5265377b3ba77acdf8c79c2b8aeb6220b4c12a4dd5265a9225c8f5c93' 
  AND token = '6LILNSU7f9IjTNNu0wKfSwgohWKj07ZptEWiOkfF6FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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