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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16fee4649b10e48ffc69486bb6aade2ae8f026b52359b140ee3ed568d4926ea' 
  AND token = 'L/Ba+Qlp+0hSr7b15tgz1yZ/8KQOzALVHLJuRTgX6C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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