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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74aa2f9f52da56a7fbfb6d850b96d0bd2b6fed07f09c244718eed00940e01d93' 
  AND token = 'T93W1L0SKab17K1MX9BbBWJaV/6StpAnVJlM/wltvPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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