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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f8f1376b856f17a48acd5a6019a3bc75deced54d25659224679590e4ec611a' 
  AND token = 'VLdbv/tVKKpDXRQgQ6zk1oQhRcyEmy16nW4dEgm2OYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00237

JSON explain

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