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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baca95039c97f9932d225f8b5fc5e8cf0bf8400f7ece79c1c58f02e8ff027347' 
  AND token = 'K+dJcEHvXy0NYiZhk9QXBiUuclaHsHpqwAS3pbIKpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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