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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de123ae1683ffa1ef6481ff721c7ca39176c2e1b295b6642af41dc5a0ec6238d' 
  AND token = 'a7EClxb+TjpxOPt7NIhR/oScTLy2DQg/n8M0ZJGenqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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