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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4215ca5b739525110d238358f148263f737b31e4b35954f6c020eb777d7d46c' 
  AND token = 'oLbf34i1D5FCvO6OIrFUDLgKTdz8rYVOe5p43KU21rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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