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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10c057f420dc0091817512afdcc45042ad886e2ac11405ac6900a52b78c1af1' 
  AND token = '5+PraMr0Kl3l3LMffI9NTXdWyZAat8oIJDzb5CJUDDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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