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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c71d1ea5bb1bce9d0f8d3c5bc511bd07a63708c09d13dbb86f3f659fccef2f' 
  AND token = '3S9KfcKI4i0aJsMywvidJxyF8qSB+BSJVyf+z3jXwLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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