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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ddeab32a2f9b9d14f519b20513ae3d72b402a1300aba7be0c7d8029651253e6' 
  AND token = 'waHpKTLXRlf0tlH+XItdGJ/8xCGAwDr4DRY7goaWkbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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