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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef8b94e982a3aaa7ddb93aeb812a5b01d6c827f59c296dd60f0409a5e7307bd' 
  AND token = 'UyuXrV4jMNiyU4m1P1HqK2cfunotnpELpHV8Xhga5KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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