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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2375b4950bc4bef982d2236aea758aeb1c7ff5721315c087bdad4741415cf8' 
  AND token = 'Od/2aPzRfR7QoLPUiPgsIfz7YEorceJ3hXVAZ9hc8lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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