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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9e912348a3341fbb8c4fdc40476d775fea940ff3eef4eaf9c0901c75bd9884' 
  AND token = 'l0j4qvKJMIcXckVO+hsmbRkhs4IHuDahmIvtZTL+Byc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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