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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1713c8a8372c7e5020de7ea10f3eb4b22ce96847ab53553194fe398211e827e' 
  AND token = '71w7izmCmkO34S8IuZuXEWyKL0Wwtq4S88hJiIqv3ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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