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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9970482c9809ed227022f17efbbea5b6efb632200cd232dad59ad8fa998bc259' 
  AND token = 'Hbm8cymGuDdFn4kkgytW62ywP5IJwBpmoEKeNwi13T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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