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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac2a55c9b99c480caf8c087335636d1d0a7065ca1ee91d471928c7545f4391e' 
  AND token = 'j7i4FiElI4sVs2NQlDuxMratLY0xa0n8B1dFEgH8DkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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