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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f16cadf84bb29390e0b7789376e12b2647f5e624838ee919bfc525a79e31039' 
  AND token = 'GpxJY5uTJXkCL5MN6SxHtoq5oANOgu27mQ4K1s43fGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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