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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7aa33e7aaf81c9a7143d9f001780be6ab4f31eaa6334bc60e3cfe5ffdf60ca' 
  AND token = 'G5NfMFmjrFIXkzQ1QUOuGUZaPyL2gGIGt/0lzhR/Npc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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