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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a59432343f20c08fa68e0caf387d5b10a1761c0168d8c1f173c55512bff896e' 
  AND token = '6onC+NiJ5T9GIAf1WXUiFVUdTzlbzB32XBT0isi/ZgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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