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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6900401338f0bb94ae58dfce8cbdb09d5a6e6be2ba5841f01d2e5a405516d001' 
  AND token = '6YmMspmcqXFfDLZhjsSXmgZE1xxwbYopnyDnIQbcX6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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