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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3d5b08ff7e2254219227ad8e6934c88b213ace182dc600ca65652b97fd2b64' 
  AND token = 'yFqbdawEh6UHljSWIrjidt0M5775R2yKI/87XmvdqtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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