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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24aac12199e1c43f2e5a72ebf1f6a65723a37fc0aefd2b046102bf183ae22c2' 
  AND token = 'TsAWO/OmJ3LDyoLLJ6x9faRSFMRnpuHS9O3ShgHrBnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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