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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa9f0b1979991f110bd675dcf12b8baf216ffb74f806a9b6bb600ad3038525e' 
  AND token = '+RiJQwG3GAURNIMSepHduXKJ7icn2FUScO02nHb6HR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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