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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2c992f76d78d64569fe6ee75d85976eaf9d834eedfbb2ac97c10bc36045386' 
  AND token = 'IBvlLHvRzeRlRTx1NxveiDyuXz5VFe7NcJC3UveMKUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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