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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc86e9bb04764403ce771f1167e0c6640e6a19b885857d08081c36bf97b5ce4' 
  AND token = 'mwYZ4pweBOBWxXp6vxt5JyAmSt98caysQ/xNF+7w3/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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