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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6747ab4940512ffa35fce9a15710e065cd2a221271e6e44e2c9eb8a81361f768' 
  AND token = 'aoPlr2Bm6ai3xp/HoUQwEE0Jzahik+zsG/MW0ndm84w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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