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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f2fdd30a14640172783ba8bd2131f1e8564cc52bd51fe4c01ec98da52bdb13' 
  AND token = 'l7S9V/hiceIbUn3ewPwZD3/8t7HGVKR5QQUNNxi6glg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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