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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb60630d7f843b5df99a4b08e0389891983964dbb07135ace1c91dc5f2adade' 
  AND token = 'nYzaVA2rgbQ4CdBF4mrCPYf6MEmY6s1c4lmYh6Uy4Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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