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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0331949c7fc91655c5012481a21b5c7ef58e0b59f965137bd9da7da067b0449d' 
  AND token = '4T+6EjdZVEgms4d00vnW7uIwWYhmNjcsMqdeiJJD+NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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