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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809dfcb624fb1f1bd4791075c2492fecf0332fee6eac0607cbe9bf876f9d911f' 
  AND token = 'BWuzPUuldhYDNbhgUZv/08X8vOf2MLlvDmawksL5W0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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