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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1285621d0a3a90986f6e59e775d388be023cb71b1ef9f54a23d875ce2f3f0d86' 
  AND token = 'yTRjg0FudLudO8dchaF/pH0zugWlbVoculTyWyH+62k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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