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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7b185344c17111bdea3562adf566202f268d9659fca9c7208b33bbc777dbc0' 
  AND token = 'c9D59wIN3DjkapX9azd+AWKvz1Hu+p9QoqZJd7a9T+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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