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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba161c26e503e812ba64d581c4e2d87a6f6baa7021858b08c13de467e9974495' 
  AND token = 'ptWTZ/uKSAv7SuoAMM4IfnsKEi5eUKGOc9pa+RypPkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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