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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034ab11af0517efb3f9279d1c06d7f551b110ff8dc05e620c14c11a5cb7d192d' 
  AND token = 'DZPmCaL2+JtyjRgGRpMY9Wy7siHzCOC7bIMBZnu7800=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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