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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5147f7c78e68a067a8f87cb5f2e56f6d60cea66b863406fec18a91d3e98327ef' 
  AND token = 't1PN0FfjQXYklfj3faav+zVos+jvHyj807a1XvtAmMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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