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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa10a55ff1ac1481241040baf91fbc0913892d609245dd570ea9129fae4d7b6c' 
  AND token = 'l+DBFL4zGAAt0E0pWds3JtyQ716lBsmsu7Jm5dM3yn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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