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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a5ca83d1dec1446ecbb5d7535db9d745614ae7c4a69b70e6d1cc20942c160f' 
  AND token = 'Ls/i22E2eBCEoB590WtmY3c/MyILrg6YKDrXas7xtnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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