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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a32cf954df28a5140867b75de31601638994c233e661c20e5f33c95b06e135' 
  AND token = 'o9KjPlB4zXOYx6iI3dQJClUrdvty1BDi9IFYEBRwvgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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