SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ac40408ae2b42f61b0373bedab7d05c98ec7752d4a2059bf9d5f10264fd7e5' 
  AND token = 'LLomjf/v+3H3WKRINqSqEVtX2im8/b4gwvO+pR9K64g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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