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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78d52819ad1a7117843b16a4fc7097d4c6ce4cfc177459faf8b2d027f9a723f' 
  AND token = '4y6RoW26TXLjY072JqW/aKNY5VcRzk5U76JedC4mGRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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